/Engine/Plugins/Compositing/Composure/Source/Composure/Classes/CompositingElement.h
enum ETargetUsageFlags { USAGE_None = 0x00, USAGE_Input = 1<<0, USAGE_Transform = 1<<1, USAGE_Output = 1<<2, USAGE_Persistent = 1<<5, USAGE_Intermediate0 = 1<<3, USAGE_Intermediate1 = 1<<4, }